Department of Mathematics


  •  Alexander Duncan, University of South Carolina
  •  Arithmetic toric varieties, endomorphism algebras and rationality
  •  02/23/2022
  •  4:00 PM - 5:00 PM
  •  Online (virtual meeting) (Virtual Meeting Link)
  •  Igor Rapinchuk (

"Ordinary" toric varieties over the complex numbers exhibit many of the behaviors of more complicated varieties but are computationally manageable. Arithmetic toric varieties play a similar role for questions over non-closed fields. In particular, while toric varieties can be seen as generalizations of projective spaces, arithmetic toric varieties can be seen as generalizations of Severi-Brauer varieties. The endomorphism algebras of exceptional objects in the derived category of an arithmetic toric variety are one way of extending the connection between Severi-Brauer varieties and central simple algebras. We discuss how properties of these algebras succeed and fail to reflect rationality properties of the varieties. This is based on joint work with Matthew Ballard, Alicia Lamarche, and Patrick McFaddin.



Department of Mathematics
Michigan State University
619 Red Cedar Road
C212 Wells Hall
East Lansing, MI 48824

Phone: (517) 353-0844
Fax: (517) 432-1562

College of Natural Science